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Phase noise simulation in ring oscillator

Ayrin

I have two questions regarding the phase noise simulation results (PSS + Pnoise) for ring oscillators:

(1) How much the precision of the initial oscillation frequency is important in estimating phase noise ?

(2) The results that I get for the phase noise seems a bit high. I feel there is a shift up in all the frequencies. In very low frequencies (close to carrier) the phase noise is largely positive. Comparing with the analysis presented in [Abidi, JSSC 2006] the phase noise sounds very high. Does someone has any idea that what could be wrong?

 

The ring oscillator designed to oscillate at 2.4 GHz using CML gates with a tail bias current of about 200 uA. 

 

Thanks in advance for your help.

 

Armin

 

Parents
  • Hi Andrew,

    You can add the option  lorentzian=yes in the additional param record, you can find this record in the pnoise options form.

    Anyway if you used a modulated analysis ( e.g. jitter analysis ) it should be better to upgrade the version of MMSIM, because the oldest versions had a problem with this kind of analysis

    BR

    Raffaele
Reply
  • Hi Andrew,

    You can add the option  lorentzian=yes in the additional param record, you can find this record in the pnoise options form.

    Anyway if you used a modulated analysis ( e.g. jitter analysis ) it should be better to upgrade the version of MMSIM, because the oldest versions had a problem with this kind of analysis

    BR

    Raffaele
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